canon 5d mark II - needs tuneup and broken LCD screen
canon 50mm 1.4 - needs repair
canon 70-200 2.8 - needs repair if I want to use a filter again but still works great
total cost for repairs: $1200

that said, should I:

pay for repairs and use this as a backup camera, then purchase the canon 5d mark iv as my main body
or should I start over altogether?
sony α7R III
Nikon d850
I shoot kids, families, dogs, sports, etc. and particularly like photojournalism and birth photography. I use Lightroom for post process. I am an amateur photographer that wishes to improve.